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789,548
thereon from the hook-nose on the shackle- bow, and cam-heads on shanks that loosely engage in perforations in the fixed casing- wall,, said shanks having exposed heads for 5 manipulation of the cam-heads, and gradua- tions on the casing-wall that are adapted to indicate the unlocked adjustment of the cam-heads.
a
In testimony whereof I have signed my name to this specification in the presence of io two subscribing witnesses. OSCAR KATZENBERGER. Witnesses: J. E. LOONEY, J. E. TRAINER.